JaCoLine - Viewing Historical Command Line #12626

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Analysis Date JDK Operating System CPU Architecture Debug JVM?
2025-05-09 OpenJDK21 Linux x86 N
Results
Switches Identified
-XX:+UnlockDiagnosticVMOptions
-XX:+UnlockExperimentalVMOptions
-XX:-OmitStackTraceInFastThrow
-XX:MaxRAMPercentage=45
-XX:InitialRAMPercentage=45
-XX:MinHeapFreeRatio=0
-XX:MaxHeapFreeRatio=100
-XX:+AlwaysPreTouch
-Xss512k
-XX:MaxDirectMemorySize=1024m
-XX:MaxMetaspaceSize=384m
-XX:ReservedCodeCacheSize=256m
-XX:+DisableExplicitGC
-XX:+UseZGC
-XX:GuaranteedSafepointInterval=0
-XX:+UseCountedLoopSafepoints
-XX:+SafepointTimeout
-XX:SafepointTimeoutDelay=1000
Switch Analysis
Name Type Description Default Value Your Value
UnlockDiagnosticVMOptions boolean Enable normal processing of flags relating to field diagnostics trueInDebug true
Analysis OK
Name Type Description Default Value Your Value
UnlockExperimentalVMOptions boolean Enable normal processing of flags relating to experimental
features		 false true
Analysis OK
Name Type Description Default Value Your Value
OmitStackTraceInFastThrow boolean Omit backtraces for some 'hot' exceptions in optimized code true false
Analysis OK
Name Type Description Default Value Your Value
MaxRAMPercentage double Maximum percentage of real memory used for maximum heap size 25.0 in range(0.0, 100.0) 45
Analysis OK
Name Type Description Default Value Your Value
InitialRAMPercentage double Percentage of real memory used for initial heap size 1.5625 in range(0.0, 100.0) 45
Analysis OK
Name Type Description Default Value Your Value
MinHeapFreeRatio int The minimum percentage of heap free after GC to avoid expansion.
For most GCs this applies to the old generation. In G1 and
ParallelGC it applies to the whole heap.		 40 in range(0, 100) 0
Analysis OK
Name Type Description Default Value Your Value
MaxHeapFreeRatio int The maximum percentage of heap free after GC to avoid shrinking.
For most GCs this applies to the old generation. In G1 and
ParallelGC it applies to the whole heap.		 70 in range(0, 100) 100
Analysis OK
Name Type Description Default Value Your Value
AlwaysPreTouch boolean Force all freshly committed pages to be pre-touched false true
Analysis OK
Name Type Description Default Value Your Value
ss <size> set java thread stack size
The actual size may be rounded up to a multiple of the
system page size as required by the operating system.		 512k
Analysis OK
Name Type Description Default Value Your Value
MaxDirectMemorySize uint64_t Maximum total size of NIO direct-buffer allocations.
Ignored if not explicitly set.		 0 in range(0, max_jlong) 1024m
Analysis OK
Name Type Description Default Value Your Value
MaxMetaspaceSize size_t Maximum size of Metaspaces (in bytes) max_uintx 384m
Analysis OK
Name Type Description Default Value Your Value
ReservedCodeCacheSize int Reserved code cache size (in bytes) - maximum code cache size
CPUDefault
x8632*M
 256m
Analysis OK
Name Type Description Default Value Your Value
DisableExplicitGC boolean Ignore calls to System.gc() false true
Analysis OK
Name Type Description Default Value Your Value
UseZGC boolean Use the Z garbage collector false true
Analysis OK
Name Type Description Default Value Your Value
GuaranteedSafepointInterval int Guarantee a safepoint (at least) every so many milliseconds
(0 means none)		 1000 in range(0, max_jint) 0
Analysis OK
Name Type Description Default Value Your Value
UseCountedLoopSafepoints boolean Force counted loops to keep a safepoint false true
Analysis OK
Name Type Description Default Value Your Value
SafepointTimeout boolean Time out and warn or fail after SafepointTimeoutDelay
milliseconds if failed to reach safepoint		 false true
Analysis OK
Name Type Description Default Value Your Value
SafepointTimeoutDelay int Delay in milliseconds for option SafepointTimeout 10000 in range(0, max_intx LP64_ONLY(/MICROUNITS)) 1000
Analysis OK
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